Caffeine has a half life of roughly 2.5 to 4 hours. Which means that in that amount of time half of the caffeine will have been metabolized by your body. Caffeine only last a few hours depending on the consumption and your activity.
The amount of time spent playing video games has a negative correlation with academic performance (Gentile, D. 2004).On the other hand children also learn obsessive language and violent behavior from these violent video games which disturb child's mental status.
Assessing the beneficial effects of video games. Some parents worry about video games, and their worries aren't unwarranted. Some video games can be engrossing, so much so that kids neglect other activities, like school work, chores, exercise, and sleep.